Izikrufu zokutywina, ezikwaziwa ngokuba zizikrufu ezingangenwa manzi, zizibophelelo ezenzelwe ngokukodwa ukunika isitywina esingangeni manzi. Ezi zikrufu zibonakalisa iwasha yokutywina okanye zigqunywe ngencamathelisa engangeni manzi ngaphantsi kwentloko yesikrufu, ikhusela ngokufanelekileyo amanzi, irhasi, ukuvuza kweoyile,...
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